Average annual temperature is 16.3 °C
Absolute maximum temperature: 38.4 °C
Absolute minimum temperature: -4.9 °C
Number of sunny days: 169 days
Number of rainy days: 193 days
Number of snow days: 3 days
Look at detailed online map of Irohachō
* Weather data for Irohachō Japan is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 15.5 | 15.0 | 20.9 | 26.1 | 28.5 | 30.6 | 37.6 | 38.4 | 32.9 | 26.1 | 25.6 | 19.5 |
| Average daytime temperature (°C) | 9.1 | 10.3 | 16.6 | 19.4 | 23.3 | 26.4 | 32.4 | 32.8 | 30.2 | 22.4 | 17.6 | 12.3 |
| Average temperature (°C) | 4.2 | 5.5 | 11.1 | 14.5 | 18.6 | 22.7 | 27.7 | 28.4 | 26.0 | 17.0 | 12.3 | 7.1 |
| Average night temperature (°C) | 0.0 | 1.6 | 6.2 | 10.0 | 14.5 | 19.4 | 23.5 | 25.1 | 22.7 | 12.6 | 8.2 | 3.0 |
| Absolute minimum temperature (°C) | -4.9 | -3.0 | 0.7 | 3.8 | 8.5 | 13.3 | 19.0 | 23.2 | 18.5 | 8.2 | 1.7 | -3.9 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.5 | 14.3 | 13.5 | 12.4 | 11.3 | 10.3 | 9.8 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 7.7 | 7.4 | 8.4 | 8.3 | 9.1 | 7.2 | 10.7 | 10.4 | 9.5 | 8.6 | 8.0 | 7.4 |
| Precipitation (mm) | 32 | 63 | 102 | 138 | 231 | 392 | 140 | 216 | 155 | 120 | 83 | 66 |
| Sunny days | 17 | 17 | 19 | 14 | 16 | 12 | 10 | 3 | 9 | 18 | 19 | 15 |
| Rainy days | 11 | 11 | 12 | 16 | 15 | 18 | 21 | 28 | 21 | 13 | 11 | 16 |
| Snow days | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Irohachō is at